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Screencloud is an app that allows you to capture screen under Linux , Mac or Windows and automatically upload the screenshot to an FTP/SFTP server of your choice or a provider in the cloud such as Dropbox, Ubuntu One, Imgur or a cloud service proposed by Screencloud themselves.

Once the file is sent, your clipboard will contain the link to the image.
This could be a good way to quickly share a screen capture without having to do the multiple steps (take/save/change it/upload somewhere/copy the url) that usually you should do to share a simple image.